[Bug 844566] [NEW] upgrade exit

Public bug reported: An unresolvable problem occurred while calculating the upgrade: E:错误，pkgProblemResolver::Resolve 发生故障，这可能是有软件包被要求保持现状的缘故。 This can be caused by: * Upgrading to a pre-release version of Ubuntu * Running the current pre-release version of Ubuntu * Unofficial software packag

[Bug 844566] Re: upgrade exit

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